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| Titel: |
RADIOMETRIC MEASUREMENT OF TEMPERATURE DISTRIBUTIONS IN SIMPLE ENCLOSURES |
| Auteur: |
Thacher, Eric F. Giannola, Peter S. |
| Verschenen in: |
Experimental heat transfer |
| Paginering: | Jaargang 5 (1992) nr. 3 pagina's 217-236 |
| Jaar: |
1992-07-01 |
| Inhoud: |
A scanning infrared radiometer, an image digitizer, a microcomputer, and the software to drive the system were employed to remotely map the temperature distribution in heated model solar cavity receivers. The receivers were right-circular cylinders. Using both reference thermocouples and enclosure analysis, the reflected radiation map of the cavity was extracted from the radiosity map measured by the radiometer to yield an emitted intensity map. Using the calibration curve of the radiometer and the in-band emissivity of the surface of the cavity, the emitted intensity map was transformed into a temperature map. The temperatures calculated from the radiometric data were compared to temperatures measured by thermocouples at several locations on the surfaces of the receivers. The average relative error for the cavities (relative to the absolute thermocouple temperatures) ranged from 4.00% to 10.10%, with the relative error on the base (small polar angle) less than that on the wall (large polar angle). Using both radiometric and thermocouple data is recommended; it gave the lowest average relative error for the cavity at high temperatures, the typical condition for receivers. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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